Lifting Chains: Grades, Types & What You Need to Know

When an overhead lift involves high heat, abrasive environments, or loads sporting sharp steel edges that would instantly sever synthetic webbing, lifting chains remain the default rigging gear. Alloy steel chain slings resist thermal degradation, ultraviolet exposure, and heavy surface abrasion in ways that other sling materials simply cannot match. Because of these distinct physical properties, they remain a standard fixture in steel mills, foundries, refineries, and heavy construction sites.

However, not all steel chains are rated for overhead lifting. The metallurgical grade stamped directly into each individual link dictates whether a chain belongs suspended under a crane hook or strapped across a flatbed trailer. Using an improper grade, overlooking mechanical wear during a pre-lift check, or ignoring the working load limits stamped on a sling tag introduces severe hazards to both the rigging crew and the load.

This technical guide breaks down the metallurgy behind chain grades, details specific sling leg configurations, and outlines exactly what a competent person must look for during OSHA-mandated inspections.

Safety & Use: The ratings and mechanical examples provided here serve as safety awareness material. Final lift plans and gear selection must follow applicable ASME standards, manufacturer data, and engineered lift planning where mandated.

What Are Lifting Chains?

Lifting chains,commonly referred to as chain slings are specific lengths of alloy steel chain assembled mechanically or welded with master links, hooks, and joining fittings into configurations rated exclusively for overhead lifting. They fall under the broader category of chains and slings governed by consensus standards such as ASME B30.9 (Slings, 2021 edition) and are strictly regulated under OSHA 29 CFR 1910.184 for general industry use.

The defining distinction that riggers must understand is that lifting chains are fundamentally different from binding chain, transport chain, or general-purpose hardware store chains. Grade dictates application. Only alloy steel chain grades specifically manufactured, heat-treated, and proof-tested for overhead lifting carry the Working Load Limits (WLL) that an overhead lift requires. Deploying a chain rated only for cargo securement in an overhead lift creates an immediate hazard; the base metal, the heat treatment process, and the factory testing requirements differ entirely.

Chain slings hold their value through sheer physical toughness. Unlike synthetic web or round slings, alloy steel chain heavily resists cuts from sharp structural edges. It tolerates elevated ambient and radiant temperatures within manufacturer-specified limits. It also maintains its rated capacity over years of brutal service,provided the sling passes strict inspection and has never been subjected to shock-loading or chemical environments beyond its intended design.

Chain Grades Explained: The Metallurgy of Lifting

The "grade" of a chain refers directly to its material class, its specific heat treatment, and its resulting mechanical yield properties. For overhead lifting, the rigging industry most commonly relies on Grade 80, Grade 100, and increasingly Grade 120 alloy steel chains, each offering different strength characteristics and performance advantages depending on the application.

Per the NACM (National Association of Chain Manufacturers) Welded Steel Chain Specifications, overhead lifting chain must consist of a specific alloy steel composition. The base metal must contain a maximum of 0.35% Carbon, a maximum of 0.035% Phosphorous, a maximum of 0.040% Sulfur, and a minimum of 0.40% Nickel (alongside specific Chromium and Molybdenum requirements).

Once welded, the manufacturer quenches and tempers the chain. Quenching (rapid cooling) locks in extreme hardness, while tempering (controlled reheating) restores ductility so the chain stretches slightly under a severe load rather than snapping like glass.

Grade 80 Chain (Alloy Steel)

Grade 80 chain serves as the baseline alloy steel chain for overhead lifting worldwide. The "80" designation corresponds directly to a nominal tensile strength of 800 N/mm².

A defining mechanical characteristic of Grade 80 chain involves its tempering temperature. Manufacturers temper Grade 80 chain at a relatively higher temperature compared to Grade 100. Because it undergoes formulation at a higher heat, Grade 80 chain exhibits better resistance to physical degradation in high-temperature service environments. This specific characteristic makes Grade 80 chain the standard specification in steel mills, foundries, forging shops, and other operations where slings encounter intense radiant or direct heat.

Per NACM specifications, operators identify Grade 80 chain by the embossed markings 8, 80, or 800 stamped periodically along the chain links.

Grade 100 Chain (High-Strength Alloy)

Grade 100 chain delivers approximately 25 percent higher working load limits than Grade 80 chain of the exact same physical diameter. The "100" designation indicates a nominal tensile strength of 1,000 N/mm².

This superior strength-to-weight ratio allows riggers to execute heavy lifts using smaller, lighter chain. A Grade 100 chain sling can either carry significantly more load at the standard chain diameter, or it can achieve the required WLL with a smaller diameter chain, drastically reducing the dead weight the rigging crew has to carry across the job site.

At Holloway Houston, Inc. (HHI), we manufacture our chain slings exclusively utilizing Grade 100 alloy steel chain. Our available chain sizes range from 1/4-inch up to 5/8-inch diameters, offering Working Load Limits from 4,300 lbs up to 22,600 lbs at a 90-degree angle (single leg).

Every Holloway chain sling undergoes a strict proof test to twice its rated WLL at our Houston testing facility before it reaches the field. We tag every sling with a permanent metal identification plate and supply the buyer with the mill certificate, proof test documentation, conformance certifications, and material test report (MTR) information. The Grade 100 chain in our slings features a black protective coating to ward off atmospheric rust.

Per NACM specifications, inspectors identify Grade 100 chain by the embossed markings 10, 100, or 1000 on the individual links.

Grade 120 Chain (Ultra-High Strength Alloy)

Grade 120 chain is a high-strength alloy lifting chain designed for demanding overhead lifting applications. The “120” designation corresponds to a nominal tensile strength of approximately 1,200 N/mm², providing about 20% higher Working Load Limits (WLL) than Grade 100 chain of the same diameter. This improved strength-to-weight ratio allows riggers to lift heavier loads or use smaller, lighter chain for the same capacity. Grade 120 chain is commonly used in heavy construction, offshore lifting, oil and gas operations, and large industrial projects. Links are typically marked “12” or “120” for identification per NACM standards.

Why Grade 30, 43, and 70 Are Strictly Excluded from Lifting

Grades below 80,specifically Grade 30 (Proof Coil), Grade 43 (High Test), and Grade 70 (Transport),are never manufactured or heat-treated for overhead lifting.

These lower grades serve utility purposes such as logging, towing, heavy-duty cargo securement, and flatbed tie-downs. They lack the specific alloy composition, the precise quench-and-temper process, and the rigorous individual proof testing required to survive the dynamic shock loads of an overhead crane pick. NACM specifications and OSHA regulations both explicitly prohibit the use of non-alloy chain grades for suspended loads.

Chain Sling Configurations and Mechanics

Manufacturers build chain slings in multiple leg configurations. Each setup suits different load geometries and center-of-gravity challenges. The total number of legs heavily dictates how the load's weight distributes across the rigging and how the sling angle impacts the final rated capacity.

Single-Leg Chain Slings

A single-leg chain sling features one continuous chain branch connected to a master link (or fitting) at the top, terminating with a hook or specialized end fitting at the bottom. Riggers deploy single-leg slings for direct vertical hitches and choker hitches on loads where a single attachment point balances the item perfectly.

Double-Leg (Bridle) Chain Slings

A double-leg chain sling,frequently referred to as a bridle sling,consists of two independent chain branches connected to a single oblong master link at the top. Each downward branch terminates with a hook. Double-leg slings dominate industrial lifts because they provide a stable two-point attachment for balanced, symmetrical loads.

Triple-Leg and Quad-Leg Chain Slings

Triple-leg and quad-leg chain slings utilize three or four chain branches connected to a master link or a sub-assembly collector ring. Crews deploy these configurations for large, unwieldy loads demanding multiple attachment points for stability.

A mandatory engineering rule regarding quad-leg slings: Industry standards dictate that quad-leg chain slings carry the exact same WLL as triple-leg slings of the same chain size and grade. Why? The mathematics of load distribution dictate that weight across four legs cannot be assumed equal. If a load is completely rigid, or if the crane hook sits slightly off-center, the entire weight of the load transfers to just two diagonally opposed legs, leaving the other two legs slack. Because perfect tension across four legs is nearly impossible to achieve in the field, engineers base quad-leg capacity charts on the assumption that only three legs actively carry the working load.

Adjustable vs. Fixed-Length Slings

Chain slings come in fixed lengths or adjustable configurations. Adjustable chain slings integrate shortening devices,such as grab hooks or specialized shortening clutches,directly into the top master link assembly. This allows the rigger to take up slack on individual legs independently. Adjustability proves highly useful when attaching to asymmetrical loads with unevenly spaced pick points. HHI manufactures both adjustable and fixed-length Grade 100 chain slings in standard increments of 3, 6, 10, 15, and 20 feet.

How Sling Angle Affects Capacity

When a rigger deploys a multi-leg chain sling, the angle that each leg makes from the horizontal plane directly alters the tension running through that specific leg. This physical phenomenon dictates the overall rated capacity of the entire sling assembly.

As the sling legs spread farther apart,meaning the angle from the horizontal decreases,the tension pulling on each leg increases exponentially. This multiplied tension reduces the sling's effective WLL. For example, lifting a 10,000-lb load with two vertical legs (90 degrees) places exactly 5,000 lbs of tension on each leg. If the rigger spreads those legs out to a 30-degree angle from the horizontal, the tension physics change completely: each leg now experiences 10,000 lbs of tension, effectively doubling the strain on the chain.

Manufacturer WLL charts account for these angle effects mathematically. HHI's chain sling product tags clearly state the rated capacities at specific sling angles from horizontal, typically listing values at 60 degrees, 45 degrees, and 30 degrees. The metal identification tag bolted to the sling and the manufacturer's capacity chart serve as the only authoritative references for angle-based load limits.

(For a deeper mathematical breakdown of sling angles and tension multipliers, read our technical guide on How Chain Sling Angles Affect Capacity.)

Chain Sling Components and Hardware

A chain sling assembly relies entirely on its end fittings. The hardware positioned at the top and bottom of the chain dictates the sling's functionality and sets the maximum WLL ceiling.

Master Links

The master link acts as the primary top fitting, consolidating the chain legs and providing the lifting point for the crane hook. Oblong master links represent the standard choice; their elongated shape easily accommodates the massive bowls of heavy-duty crane hooks without binding. Pear-shaped master links see use in highly specific applications where narrow hooks are present or where only one or two small branches connect.

Rigging Hooks

Chain sling hooks drop into three primary categories based on their throat design and latch mechanism:

• Grab Hooks (SOG - Sling On Grab): These feature a highly narrow throat designed to engage and lock onto an individual chain link. Riggers use grab hooks exclusively for creating choker hitches or shortening a leg length. Modern cradle-style grab hooks fully support the chain link, preventing capacity reduction.
• Sling Hooks (SOS - Sling On Sling): These are standard, general-purpose lifting hooks featuring a wide throat for connecting to structural load attachment points, pad eyes, and hoist rings. They incorporate a spring-loaded safety latch.
• Self-Locking Hooks (SOSL): These feature a heavy-duty mechanical latch mechanism that snaps shut and locks automatically the moment the hook takes on tension. The rigger must manually press a release trigger to open the hook. This design eliminates the chance of accidental disengagement if the load bounces or catches an obstruction.

Coupling Links and Connecting Hardware

Mechanical coupling links join lengths of chain together or connect the chain to the master links and hooks. ASME B30.9 (2021 edition) explicitly states a strict operational rule: if a mechanical coupling link joins chain links into an endless sling configuration, the coupling link itself must not bear directly against the load, a hook, or another fitting. The coupling link must remain in the straight, tensioned span of the chain.

Every single piece of connecting hardware in the assembly carries its own rating. The overall WLL of the entire chain sling can never exceed the rating of its weakest single component.

Chain Sling Inspection Awareness

Inspection protocols determine whether a chain sling stays on the job site or goes into the scrap bin. Both OSHA 29 CFR 1910.184 and ASME B30.9 mandate strict inspection frameworks for alloy steel chain slings. Understanding the exact signs of mechanical fatigue is a base requirement for heavy lifting.

Pre-Use Inspection

Before executing any lift, OSHA 1910.184(d)(2) dictates that a designated competent person must inspect the chain sling and all its fastenings for damage or defects. This tactile and visual check happens directly on the job site before the master link ever touches the crane block.

Periodic Documented Inspection

Beyond the daily pre-use checks, alloy steel chain slings require highly thorough periodic inspections. OSHA 1910.184(e)(2) mandates these formal inspections at intervals based on the severity of service conditions, but at a strict minimum of once every 12 months. The standard requires the employer to make and maintain a permanent written record documenting the most recent month in which each individual alloy steel chain sling underwent this thorough inspection.

Mandatory Removal Criteria

If a competent person or inspector observes any of the following physical conditions, they must immediately remove the chain sling from service.

• Stretch or Elongation: ASME sets the maximum allowable elongation for a chain link at 5%. Inspectors measure stretch across a specific reach of links using calipers, comparing the current length against the original dimension stamped on the tag.
• Wear at Contact Points: Inter-link wear occurs where the links rub against each other. NACM rules mandate removal if wear reduces the cross-sectional diameter of the link by 10% or more.
• Nicks, Gouges, or Corrosion: Deep surface damage acts as a stress riser, severely reducing the effective cross-section and tensile capacity of the link.
• Bent or Twisted Links: Any deformation from side-loading, corner pulling, or impact drops requires removal.
• Cracks: Any microscopic or visible crack in any link, master ring, hook, or weld means immediate retirement.
• Heat Damage: Surface scaling, blue/straw discoloration, or visible weld spatter indicates the metal absorbed heat beyond its rated temperature range, destroying its temper.
• Missing or Illegible Tags: OSHA 1910.184(e)(1) requires permanently affixed, durable identification stating the size, grade, rated capacity, and reach. If the tag is missing or unreadable, the rigger cannot verify the WLL, and the sling is automatically condemned.

Proof Testing

New, repaired, or reconditioned alloy steel chain slings must undergo proof testing by the sling manufacturer before being placed into active service. As mentioned, HHI proof tests every manufactured chain sling to twice its rated WLL, attaching the proof test certification directly to the shipment.

Alloy Steel Chain Slings vs. Other Sling Types

Chain slings represent one of several lifting mediums covered under ASME B30.9 and OSHA 1910.184. Reviewing how chain compares to wire rope and synthetic fibers clarifies why riggers specify chain for severe duty.

(For a comprehensive breakdown on selecting between these materials, see our broader guide on Rigging and Lifting Slings.)

Equipment Sourcing and Fabrication

Lifting chains dominate demanding applications where thermal limits, sharp edge abrasion, and caustic environmental exposure would rapidly destroy other sling types. Understanding alloy chain grades, recognizing angle tension physics, and strictly enforcing inspection triggers keep rigging crews alive. Always default to the sling identification tag and the manufacturer's documentation for specific ratings and angle-based capacities.

Shop Chain Slings at Holloway Houston

Holloway Houston carries a full inventory of Chain Slings rated to ASME/OSHA standards. Browse our selection:

• Shop Holloway Grade 100 Chain Slings

Related Articles -

• How Chain Sling Angles Affect Capacity
• Rigging and Lifting Slings

Need help selecting the right Chain Slings? Call us at 713-675-3900 or Request a quote online.